Method and apparatus for continuously pulping cellulosic fibrous material
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United States of America Patent
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Issued Date -
Sep 27, 2001
app pub date -
May 31, 2001
filing date -
Oct 2, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
In the production of chemical pulp, such as kraft pulp, it is possible to reduce the amount of ancillary equipment, and/or the size of the continuous digester vessel, while achieving enhanced uniformity of treatment by avoiding 'hang ups'. Instead of providing vertical counter-current flow of liquid and comminuted cellulosic fibrous material being treated in the lower half of the digester, the counter-current flow may be a cross flow, that is substantially horizontal (e.g. radial) while the flow of the chip column is vertical. Regardless of the configuration of the digester vessel, a single pump may be utilized for all of the recirculations, or only a few pumps for all of the recirculations.
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